<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "Funding Free Software", the Front-Cover
Texts being (a) (see below), and with the Back-Cover Texts being (b)
(see below).  A copy of the license is included in the section entitled
"GNU Free Documentation License".

(a) The FSF's Front-Cover Text is:

A GNU Manual

(b) The FSF's Back-Cover Text is:

You have freedom to copy and modify this GNU Manual, like GNU
     software.  Copies published by the Free Software Foundation raise
     funds for GNU development. -->
<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Adding a new GIMPLE statement code (GNU Compiler Collection (GCC) Internals)</title>

<meta name="description" content="Adding a new GIMPLE statement code (GNU Compiler Collection (GCC) Internals)">
<meta name="keywords" content="Adding a new GIMPLE statement code (GNU Compiler Collection (GCC) Internals)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html#Top" rel="start" title="Top">
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">
<link href="Statement-and-operand-traversals.html#Statement-and-operand-traversals" rel="next" title="Statement and operand traversals">
<link href="Sequence-iterators.html#Sequence-iterators" rel="prev" title="Sequence iterators">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en">
<a name="Adding-a-new-GIMPLE-statement-code"></a>
<div class="header">
<p>
Next: <a href="Statement-and-operand-traversals.html#Statement-and-operand-traversals" accesskey="n" rel="next">Statement and operand traversals</a>, Previous: <a href="Sequence-iterators.html#Sequence-iterators" accesskey="p" rel="prev">Sequence iterators</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Adding-a-new-GIMPLE-statement-code-1"></a>
<h3 class="section">12.11 Adding a new GIMPLE statement code</h3>
<a name="index-Adding-a-new-GIMPLE-statement-code"></a>

<p>The first step in adding a new GIMPLE statement code, is
modifying the file <code>gimple.def</code>, which contains all the GIMPLE
codes.  Then you must add a corresponding gimple subclass
located in <code>gimple.h</code>.  This in turn, will require you to add a
corresponding <code>GTY</code> tag in <code>gsstruct.def</code>, and code to handle
this tag in <code>gss_for_code</code> which is located in <code>gimple.cc</code>.
</p>
<p>In order for the garbage collector to know the size of the
structure you created in <code>gimple.h</code>, you need to add a case to
handle your new GIMPLE statement in <code>gimple_size</code> which is located
in <code>gimple.cc</code>.
</p>
<p>You will probably want to create a function to build the new
gimple statement in <code>gimple.cc</code>.  The function should be called
<code>gimple_build_<var>new-tuple-name</var></code>, and should return the new tuple
as a pointer to the appropriate gimple subclass.
</p>
<p>If your new statement requires accessors for any members or
operands it may have, put simple inline accessors in
<code>gimple.h</code> and any non-trivial accessors in <code>gimple.cc</code> with a
corresponding prototype in <code>gimple.h</code>.
</p>
<p>You should add the new statement subclass to the class hierarchy diagram
in <code>gimple.texi</code>.
</p>




</body>
</html>
